Sofosbuvir Impurity 81 CAS CATO-C4X-105281

Description

Compared with other compounds in its class, the molecular weight of 571.55 g/mol gives Sofosbuvir Impurity 81 distinctive chromatographic separation conditions and mass-spectrometry parameter settings.

Sofosbuvir Impurity 81 (CAS CATO-C4X-105281) is a certified pharmaceutical impurity reference standard with the molecular formula C31H26FN3O7 and a molecular weight of 571.55 g/mol.

The molecular framework of Sofosbuvir Impurity 81 (C31H26FN3O7) is characterized by a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage, fluorine substitution. In reversed-phase chromatography, its retention is governed primarily by the protonation state of its nitrogen-containing groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).

This reference standard supports related-substances testing and method development in line with ICH Q3A/Q3B guidance on impurity control, and is suitable for system suitability testing and forced-degradation studies.

The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.

Physical & Chemical Properties

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